On a certain transatlantic crossing, 20 percent of a ship’s passengers held round-trip tickets and also took their cars abroad the ship. If 60 percent of the passengers with round-trip tickets did not take their cars abroad the ship, what percent of the ship’s passengers held round-trip tickets?

Let's denote the number of people on the round trip by x and the number of people who travel one-way by y.On one side, the number of people on the round trip with a car is 40% of the people on the round trip, which is 0.4x.On the other side they make 20% of all the passengers, which is 0.2(x + y).0.4x = 0.2x + 0.2yx = y

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